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- W2019910246 abstract "Different implementations of the preconditioned conjugate gradient method are presented for solving large and very ill-conditioned algebraic systems of equations resulting from the finite element method. A special implementation based on mixed precision calculations proved to be robust in performance and reliable in accuracy as well as storage effective. Additionally, a new type of iterative refinement scheme is introduced to improve the accuracy of direct methods based on conjugate gradient iterations; it is found to be a significant improvement on the standard iterative refinement approach." @default.
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- W2019910246 title "Accuracy and effectiveness of preconditioned conjugate gradient algorithms for large and ill-conditioned problems" @default.
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